3481-20 Non Contact Voltage DetectorHioki leads the industry in non metallic contact test and measurement technology that promotes safety on the worksite. The Hioki 3481 is a pen style, non metallic contact voltage detector with a bright LED light that promotes safety and work efficiency even in dim worksites. When voltage is detected, the LED lights red along with an audio signal. FEATURES Pen style, a compact detector with a pocket clip Both visual and audible voltage detection